Particle Lifetimes And Neutrino Constraints On Ultraviolet Theories
In order to help the search for new physics we propose two methods for relating experimental results to theories. First, measurements of lifetimes can be done in two ways. For very short lived particles, the width can be measured. For long lived ones, the lifetime can be directly measured, for example, using a displaced vertex. Practically, the lifetime cannot be extracted for particles with intermediate lifetimes. We show that for such cases information about the lifetime can be extracted for heavy colored particles that can be produced with known polarization assuming we can measure their spin. Second, neutrino oscillation experiments are known to be sensitive to Non-Standard Interactions (NSIs). We extend the NSI formalism to include one-loop effects. We show how the parameters that can be extracted from the experiments are obtained from various loop amplitudes, which include vertex corrections, wave function renormalizations, mass corrections as well as box diagrams. We argue that the size of one-loop NSIs can be large enough to be probed in future neutrino oscillation experiments.
Lifetimes; Spin; Hadronization; Neutrino; NSI; UV; BSM; One Loop; EFT
Wittich, Peter; Csaki, Csaba
Ph.D. of Physics
Doctor of Philosophy
dissertation or thesis